Because the majority of the proposed nerfs would make it unworthy of an exotic slot. Because literally any hand cannon can 2 shot you with either Luck in the Chamber or Final Round, TLW and Hawkmoon included. Because it is not an unbeatable weapon and has several counters (have you tried killing the Thorn user first?). Because if we're in an active firefight, where you're shooting at me and I'm shooting at you, if one of us lands two headshots, that kill was earned. If a Thorn user gets the drop on you, 9/10 you would be dead regardless of the weapon they're using.